It won't actually be completed until 2012, says Google's director of green business operations, Rick Needham, who wrote about the investment on their blog: "When completed in 2012 [the plant] will produce 845 MW of energy. This will be the first commercial wind farm in the U.S. to deploy, at scale, turbines that use permanent magnet generator."

Needham added that the electricity from the world's largest wind farm will be sold to Southern California Edison, and will produce enough energy for 235,000 homes. [Google Blog via CNET]